commands: make backout acquire locks before processing...
commands: make backout acquire locks before processing
Before this patch, "hg backout" executes below before acquisition of
wlock.
- cmdutil.checkunfinished()
- cmdutil.bailifchanged()
- repo.dirstate.parents()
It may cause unintentional result, if another command runs parallelly
(see also issue4368).
In addition to it, "hg backout" refers changelog for purposes below
without acquisition of store lock (slock), and it may cause
unintentional result, if store is updated parallelly.
- show and update to the revision by 'repo.changelog.tip()'
- examine for "created new head" by 'repo.branchheads()' and
'cmdutil.commitstatus()'
To avoid this issue, this patch makes "hg backout" acquire wlock and
slock before processing.
